Commands are stored in memory and prevents duplicate jobs

NzbDrone.Common/Messaging/CommandEqualityComparer.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using NzbDrone.Common.EnvironmentInfo;
+
+namespace NzbDrone.Common.Messaging
+{
+    public class CommandEqualityComparer : IEqualityComparer<ICommand>
+    {
+        public bool Equals(ICommand x, ICommand y)
+        {
+            var xProperties = x.GetType().GetProperties();
+            var yProperties = y.GetType().GetProperties();
+
+            foreach (var xProperty in xProperties)
+            {
+                if (xProperty.Name == "CommandId")
+                {
+                    continue;
+                }
+
+                var yProperty = yProperties.SingleOrDefault(p => p.Name == xProperty.Name);
+
+                if (yProperty == null)
+                {
+                    continue;
+                }
+
+                if (!xProperty.GetValue(x, null).Equals(yProperty.GetValue(y, null)))
+                {
+                    return false;
+                }
+            }
+
+            return true;
+        }
+
+        public int GetHashCode(ICommand obj)
+        {
+            return obj.CommandId.GetHashCode();
+        }
+    }
+}